They don't want it finished. In the game depending on your choices you can probably end up with Yui, Cui, Cryska, Inia, Tarisa... Who do you want Yuuya to be with? Your choice!

Who does care which girl Yuuya gets?
Who was behind the attack at Yukon base? Who did attack Kamchatka and why? What do the BETA want? Are they really only brainless eaters? What is Sandek's great plan he would kill everybody for? What .. What.. What?? (see there is more than girls ^.^)

They don't want it finished. In the game depending on your choices you can probably end up with Yui, Cui, Cryska, Inia, Tarisa... Who do you want Yuuya to be with? Your choice!

Who does care which girl Yuuya gets?
Who was behind the attack at Yukon base? Who did attack Kamchatka and why? What do the BETA want? Are they really only brainless eaters? What is Sandek's great plan he would kill everybody for? What .. What.. What?? (see there is more than girls ^.^)

All just back setting for which girl Yuuya will pick. This is the alternative universe version which has brain eating BETA. The standard version is just a love visual novel without mecha or aliens. Both really have the same purpose, to fall in love. Believe it or not, the aliens and Soviets are not really that important... Crazy I know!!!

Regarding the end of the show, there is a possibility of a second season, since the Alternative universe is based of the light novels which currently has 5 volumes out as far as i know which i think is meant to cover all the 25 episodes? I am not sure havent read them since they not out in English. We can only hope that a second season will be released with all the questions answered because there is a billion of them !!! But it will probably have to wait until further light novels has been released

I just watched the last episode, and my opinion of this show is its largely meh. I heard that there was a game that takes place after the events of the anime, but considering the vast majority of us will never get to play it, it kind of sucks. Sorry about the essay, but bear with me for a bit.

I wasn't a big fan of the show not being sure what genre it wanted to be in. Sci-fi, alien invasion, harem, or political conspiracy and cover ups? I found the first two episodes to be spectacular, then it kind of goes up and down from there. For a show that's supposed to be about fighting hostile aliens, like Yuuya in one episode, I wonder why they focused so much on fighting other humans instead.

What I would have liked to see was missions where they have to go behind BETA lines and try to rescue someone or get a macguffin that's buried away somewhere. And the reason they have to go get it and not some random military unit is because they just happen to be really close to where said item/person is at the time, and they don't have much time before the BETA infests the area too much. Or the army needs to draw the bulk of the BETA's forces so Argos Flight can sneak in and retrieve the item/person.

Or maybe they test a new weapon which is supposed to be super awesome too, like that rail gun from the Russian arc, but it either doesn't work, or it works a bit too well, and the weapon explodes, heavily damaging the TSF as well as the BETA. Would be interesting to see one of the characters get hospitalized as a result, and the drama that follows, particularly with whoever developed that weapon and the pilot who was using it.

Or an episode where there's just a couple of BETA, but the characters are not in a TSF suit to fight them, and have to evade them. Kind of like how Yui was stuck in the Russian base initially. Sure, a ton of them are scary, but we also want them to survive, not to mention boring if there's too many. It can get pretty tense if there's only 3 BETA around, but you have no way to fight back effectively right away.

As for character building, I would have loved to see the other character's backstory via flashbacks. Remember how they mention Tarisa, VG, and Ibrahim being from countries that were overrun by the BETA? Wouldn't you have wanted to see exactly what they did prior to joining Argos Flight, and what they were doing in a vain attempt to defend their homelands from getting overrun? Ibrahim was apparently a hero to many refugees according to one of the RLF terrrorists, and I would have loved to see the tough decisions he was forced to make. Basically, an episode or two that covers their story, kind of like how the first two episodes shows what Yui did prior to coming to Alaska base.

Again, the anime should have stood on its own as a series/show. Sure, it can still lead into a followup game, but the way it ended was kind of meh. Imagine if instead of filler episodes, they had some like the scenarios I just mentioned. It probably would have been more interesting and helped develop the characters more as well.